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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4IN' 404 N Wiget Lane Walnut Creek CA 94598 (5i0) 988 9600 FAX (510)988 9673 <br /> 1Ilw Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br />' Pacific Environmental Group Client Project ID 311-174 1A/BP 5447, Stockton <br /> 2025 Gateway Place, Suite 440 Matrix SOLID <br />' San Jose, CA 95110 <br /> Attention Jessica Nelllgan Work Order# 9802209 01, 02 Reported Feb 11, 1998 <br /> N <br />' QUALITY CONTROL DATA REPORT <br />' Analyte MTBE <br /> QC Batch# MS020698MTBEEXA <br /> Analy Method EPA 8260 <br />' Prep Method <br /> Analyst M Williams <br /> MS/MSD # 980220902 <br />' Sample Conc 300 <br /> Prepared Date 2/6/98 <br /> Analyzed Date 2/6/98 <br />' Instrument I D # M6 <br /> Conc Spiked 2500 ug/Kg <br /> Result 2600 <br /> MS % Recovery 92 <br /> Dup Result 2700 <br />' MSD %Recov 96 <br /> RPD 38 <br /> RPD Limit 0-25 <br /> LCS# LCS020698 <br /> IPrepared Date 2/6/98 <br /> Analyzed Date 2/6/98 <br />' Instrument I D # rf6 <br /> Conc Spiked 2500,ug/Kg <br /> LCS Result 2300 <br /> LCS %Recov 92 <br /> IVISD 60-140 <br /> LCS 70-130 <br /> Control Limits <br />' Please Note <br /> The LCS is a control sample of known,interferent4ree matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Tod Granlcher **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager 9802209 PPP <2> <br />